Altar of Dementia + Sage of Hours Combos

2 known combos featuring both cards in Commander

Infinite LTB Infinite ETB Infinite sacrifice triggers Infinite death triggers Infinite mill

Combo 1 with Vhal, Candlekeep Researcher + Haunted One + Faces of the Past

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite mill · Infinite self-mill · Infinite colorless mana that can't be spent to cast spells from your hand · Infinite untap of all Humans · Infinite power for certain creatures until end of turn · Infinite untap of all Wizards
Steps
  1. Activate Vhal by tapping it, adding an amount of {C} equal to Vhal's toughness that cannot be spent to cast spells from your hand.
  2. Haunted One triggers, causing Humans and Wizards you control to get +2/+0 and to gain undying until end of turn.
  3. Activate Sage of Hours by removing all +1/+1 counters from it.
  4. Activate Altar of Dementia by sacrificing Sage of Hours.
  5. When Sage of Hours dies, its undying ability and Faces of the Past trigger.
  6. Resolve the Sage of Hours trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  7. Resolve the Faces of the Past trigger, untapping all Humans and Wizards.
  8. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Sage of Hours' power.
  9. Repeat.

Combo 2 with Polukranos, Unchained + The Ozolith

Results: Infinite turns · Lock
Show steps
  1. Cast Polukranos Unchained from your graveyard for its escape cost by paying {4}{B}{G} and exiling six other cards from your graveyard, causing it to enter the battlefield with twelve +1/+1 counters on it.
  2. Activate Altar of Dementia by sacrificing Polukranos Unchained.
  3. When Polukranos Unchained dies, The Ozolith's first ability triggers, putting twelve +1/+1 counters on it.
  4. Resolve the Altar of Dementia ability, causing you to mill cards equal to Polukranos Unchained's power.
  5. At the beginning of your combat phase, The Ozolith's second ability triggers, moving the +1/+1 counters from it onto Sage of Hours.
  6. Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take at least two extra turns after this one.
  7. Repeat during your second extra turn.
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